ROBUST: the cake pan is made of 1 mm-thick, warp-resistant carbon steel, which is oven safe to 220C (428F). LOOSE BOTTOM: the pop-up base ensures neat results, so it's ideal for baking impressive middle tiers, as well as fruit and sponge cakes. International products have separate terms, are sold from abroad and may differ from local products, including fit, age ratings, and language of product, labeling or instructions.. . MasterClass Square Non-Stick Deep Cake Tin, Carbon Steel Loose Base Bake Pan, 23cm in Dark Grey